Acceptable to ask dr.?

My son has his 3 year old check up at 9 a.m. I have very little experience with the Dr. as my kids are never sick and I don't take them in unless they are dying, lol.

My 7 year old just woke up and with a very red and swollen and sore eyelid. It's drooping to about half of her eye ball. Is it acceptable to ask the dr. to look at it this morning? The nurse lines do not open till 9, either, so I cannot call and try to make her a seperate appointment. Every magazine I ever read on this issue always says to not expect your dr. to look at multiple family members for one kid's appointment and I certainly don't want to take advantage, but in this case, it seems silly to do anything else like a prompt care or seperate appointment since we will be there in 1.5 hours.

Would you ask the dr. to look at her eye and how would you approach him? He's a very nice man with 5 kids of his own so I'm sure he would not be offended, but like i said, I don't want to take advantage. If he looks at her, he will see it himself anyway, I guess.